Question

question a please ........... i will thank him and mark it as brainliest

Answer 1

Heya mate,Here is ur answer

Let the common ratio be x.

A/Q

Length:Breadth:Height = 3:2:1

So, length=3 x

Breadth=2 x

Height=x

Volume of cuboid=10368 cm^3

But volume of cuboid= l×b×h

so, 10368= lbh

10368=3x× 2x × x

10368=6 x^3

10368/6= x^3

1728 = x^3

$\sqrt[3]{1728} = x$


12 = x

So, length=3 x

=3×12

=36 cm

Breadth=2x

=2×12

=24 cm

Height=x

=12 cm

So, total surface area of the cuboid=2(lb+bh+hl)

=2(36×24+24×12+12×36)

=2(864+288+432)

=2×1584

=3168 cm^2

1 cm =1/100 m

1 cm^2 =1/100^2

1 cm^2 =1/10000 m^2

So, 3168 cm^2 = 3168/10000

=0.3168 m^2

Cost of polishing 1 m^2 = ₹ 2.50

Cost of polishing 0.3168 m^2 = ₹ 2.50× 0.3168

=₹0.792

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@Laughterqueen

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